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公开(公告)号：US2813215A
公开(公告)日：1957-11-12
申请号：US45621554
申请日：1954-09-15
Applicant: RCA CORP
Inventor： REICHERT ROBERT D
IPC: H01J19/28
CPC classification number: H01J19/28 , H01J2893/0013
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